Button sewing machine



Oct. 25, I938; F. A. REECE ET AL BUTTON SEWIHG MACHINE Filed July 7, 1936 16 Sheets-Sheet 1 INVEN I-IJ E Oct. 25, 1938. F. A. REECE ET AL I BUTTON SEWING MACHINE Filed July 7, 1936 16 Sheets-Sheet 2 Raf- II I INVEN+EI O .2: I R I A Pr s 0d 25, 1938. F. A. REECE El AL I BUTTON SEWING MACHINE Filed July 7, 1936 16 Sheets-Sheet 3- hmfi \R w H in I- 0 a. w J. -U k g 7 M fl. RN. I

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Oct. 25, 1938. F. A. REECE E TAL BUTTON SEWING MACHINE Filed July 7, 1936 16 Sheets-Sheet 4 Oct. 25, 1938. REEE r AL 2,134,417

BUTTON SEWING MACHINE Filed 'July 7, 1936 16 Sheets-Sheet '5 Oct. 25, 1938. F. A. Rama ETAL 2,134,417

BUTTON SEWING MACHINE Filed July 7, l9 36 l6 Sheets-Sheet 6 TlQl INVENi'El 5: ML. W i

16 Sheets-Sheet 7 Filed .July 7, 193a F. A. REECE ET AI BUTTON SEWING MACHINE Oct. 25, 1938. F; A. REECE :r m.

I BUTTON SEWING MACHINE l6 Sheets-Sheet 8 D- A P L N\.\/ P M EH1 H Filed July 7, 1936 Oct. 25, 1938. F. A. REECE El Al. 2,134,417

BUTTON SEWING MACHINE Filed-Jul 7, 1936 16 Sheets-Sheet 9 IEIRE 16 Sheets-Sheet 10 INVEN F. A. REECE ET AL BUTION SEWING MACHINE Filed July 7, 1936 Oct. 25, 1938.

Oct. 25, 1938. F. A. REECE ET AL BUTTON SEWING MACHINE Filed July 7, 1936 16 S heets-Sheet 11 'Oct. 25, 1938. P; A. REECE El -AL BUTTON swine MACHINE GYM l6 Sheets-Sheet 12 ll? lsiiiiie,

Filed July 7, 1936 m gem Oct. 25, 1938. REECE AL BUTTON snwme mourns 16 Sheets-Sheet 13 Mk hw i g QM Filed July 7, 1936 Oct. 25, 1938. A. n zzcs ET AL BUTTON SEWING MACHINE Filed July 7, 1936 i6 Sheets-Sheet 14 Oct. 25, 1938. F. A. REECE ET AL 2,134,417

BUTTON SEWING MACHINE Fil ed July 7, 1936 16 Sheets-Sheet 1s Filed July 7, 1936 16 Sheets-Sheet 16 w a q H b v 1 H m a a w 4 X J x 1 l l w T W K 3 L: 6 a 2 2 W FF... WM W Z 1 w w J/ W J .M 4 W a 4 n. 1 J a 7 mM/ 1 6 u am A T 2 a a g m y W w the type above referred to, and has for an im- Patented a. 25, 1938 2,134,417

UNITED STATES PATENT OFFICE BUTTON SEWING MACHINE Franklin A. Reece, Brookline, Mass., and Samuel W. Avis, Providence, R. 1., assignors to The Reece Button Hole Machine C0mpany,Boston, Mass., a corporation of Maine Application July 7, 1936, Serial No. 89,330

29 Claims. (Cl. 112-111) This invention relates to machines for sewing manually set for automatic operation in accordon buttons, especially substantially flat buttons ance with the requirements of a wide variety of having perforations or holes through which the work. attaching thread is passed.- Such buttons are The foregoing and other objects of the invenof a wide variety of shapes and sizes, the number tion, together with means whereby the latter may and spacing of the thread receiving holes diflerbe carried into effect, will best be understood ing in different buttons, and the number of from the following description of an illustrative stitches required for their satisfactory attachembodiment thereof. shown in the accompanying ment varying with the number of holes, the size drawings. The particular mechanism described of the buttons, and the purpose and location of andshown has, however, been chosen for purtheir attachment. poses of exemplification merely, as it will be In another application, Serial No. 60,616, filed obvious to those skilled.in the art that the in- January 24, 1936, by Franklin A. Reece, one of vention, as defined by the claims hereunto apthe present applicants, is described an improved pended, may be otherwise embodied without debutton sewing machine in which all of the move- 'parture from the spirit and scope thereof. ments necessary to attach either a two hole or a In said drawings: four hole button are imparted to the stitch form- Fig. 1 is a side elevation, partly broken away, ing instrumentalities, as distinguished from the of the complete machine. work holding instrumentalities, and which can be set to attach either a two hole or a four hole button, having holes of any spacing within the range of the machine, by means of a variable number of groups of. stitches, the threadbeing secured by a tying stitch at the completion of each group of attaching stitches. Said machine is entirely automatic and, having been setin operation with the work properly positioned therein, will perform andcomplete the sequence of operations for which it has previously been set or adjusted and thereafter come to rest.

The present invention relates to certain portions of the operating and controlling mechanism of automatic button sewing machines, and especially, although not exclusively, to machines of attachment of two diiferent types of buttons.

Fig. 4 is a horizontal section taken substantially on the line 4-4, Fig. 1.

Fig. 5 is a detail section on the line 5-5, Fig. 1.

Fig. 6 is a horizontal section taken substantially on the line 66, Fig. 1.

i Fig. 7 is a detail section taken Substantially on the line 'I-l, Fig. 1. I

Fig. 8 is a front elevation, partly broken away, of the complete machine.

Fig. 9 is a ver ical section taken substantially on the line 9-9, g. 1.

Fig 10 is a detail section taken substantially on the line Ill-l0, Fig. 1.

Fig. 11 is a plan view, and

Fig. 12 a side elevation of the main cam.

Fig. 13 is a fragmentary detail section on the line |3--l3, Fig. 12.

Fig. 14 is a detail view of a portion of the adjusting mechanism for controlling the amplitude of the lateral movements of the stitch forming instrumentalities in accordance with the spacing of the holes in the button.

Fig. 15 is a fragmentary detail view of the mechanisms for producing the various movements of the needle.

Fig. 16 is a detail perspective view of the lower needle bar guide carrier through which the horizontal movements of, the needle are effected and controlled.

Fig. 1'! is a plan view, partly in section on the line I'I-I'I, Fig. 15.

Fig. 18 is a detail section taken substantially on the line |8-l8, Fig. 17.

Fig. 19 is a detail section taken substantially on the line |9-I9, Fig. 18.

portant object to provide means whereby the number of stitches in each group, that is to say, the number of attaching stitches preceding each tying stitch, as well as the number of groups of stitches, can be varied in accordance with the requirements of the work.

Another object of the invention is to provide a simple and effective stop motion control which can be easily and conveniently set to determine the number of groups of stitches which are automatically formed.

A further object of the invention is to provide, in a button sewing machine in which the needle is moved laterally in a plurality of. directions, means for adequately supporting the work while permitting all of said lateral needle movements.

Additional objects of the invention are to provide readily and conveniently operable adjusting and coordinating devices for the several controlling devices whereby the machine can readily be Figs. 2 and 3 are detail views illustrating the Fig. 20 is a detail section taken substantially on the line 28-20, Fig. 15.

Fig. 21 is a detail plan view, looking from the top of Fig. 15, of the devices for adjusting the mechanism to vary the amplitude of the fore and aft movements of thestitch forming devices.

Fig. 22 is a detail perspective view of certain of the elements of the mechanism shown in Figs. 15, 1'7 and 20.

Fig. 23 is a fragmentary detail view of the mechanism for effecting and controlling the movements of the looper carrier and loopers.

Fig. 24 is a similar view looking from the left in Fig. 23 with certain parts added.

Fig. 25 is a fragmentary plan view of the same mechanism.

Fig. 26 is a detail sectional view, taken substantially on the line 26-26, Fig. 23, of a part of the means for controlling the amplitude of oscillation of the looper carrier.

Fig. 27 is a detail section. taken substantially on the line 21-21, Fig. 26.

Figs. 28 and 29 are views similar to Fig. 1'7, showing different adjustments of the parts to vary the needle movements in accordance with the work to be done.

Fig. 30 is a detail section taken substantially on the line 30-38, Fig. 6.

Fig. 31 is a detail section taken substantially on the line 3l-3I, Fig. 30.

Fig. 32 is a fragmentary longitudinal vertical section taken substantially on the line 32-32,

Fig. 36, of the rear portion of the machine, showing certain of the driving connections.

Figs. 33, 34 and 35 are fragmentary detail views of certain of the parts in Fig. 32, showing them in different positions.

Fig. 36 is a horizontal section taken substantially on the line 36-36, Fig. 32.

Fig. 37 is a detail section taken substantially on the line 31-31, Fig. 32.

Fig. 38 is a detail section taken substantially on the line 38-38, Fig. 36.

Fig. 39 is a vertical section taken substantially on the line 39-39, Fig. 32.

Fig. 40 is a fragmentary detail view of certain of the parts in Fig. 39.

Fig. 41 is a detail sectional view of the drive shaft and associated parts shown in Fig. 39.

Figs. 42 and 43 are detail sections taken substantially on the lines 42-42 and 43-43, respectively, Fig. 36, showing the parts in different positions.

Fig. 44 is a fragmentary perspective view illustrating a modification of the setting devices.

Fig. 45 is a view, looking from the right in Fig.

I 44, of certain of the parts shown in the latter figure.

Fig. 46 is a longitudinal sectional view of the forward part of the base of the machine.

Fig. 47 is a detail plan view of the throat plate.

Referring to Figs. 1, 4, 6, 8 and 9, the frame or casing of the machine comprises a base or bed Hi and an overhanging head H supported therefrom by an upright housing portion 12 enclosing the principal parts of the operating and controlling devices. For convenience of assembly and repair, said frame or casing comprises two separable main sections A and A (Fig. 1) connected and relatively positioned by dowels (1 (Figs. 4, 32 and 38) and several attached minor parts all of which collectively afford the necessary enclosures, supports, bearings, etc., for the various moving parts.

The bed 78 carries a work: supporting throat plate 13 (hereinafter more fully described) upon which the fabric W to which the buttons are to be attached is supported and against which it is clamped by a presser foot 14 carrying a button clamp 15 for holding the individual buttons and positioning them for the operation of the sewing instrumentalities.

The main driving and controlling instrumentalities include a main power shaft 16 journalled in suitable bearings in the head H and to which power may be applied through a belt pulley 11 under the control of automatic stop mechanism hereinafter described; a vertical cam shaft 18 journalled in suitable bearings in the housing 12, driven through connections hereinafter described from the main shaft 16, and provided with suitable cams for controlling the movements of the several instrumentalities; and a horizontal looper shaft 19 journalled in suitable bearings in the base 10 and operated and controlled from the cam shaft 18.

The stitch-forming instrumentalities include an eye-pointed needle 80 carried by a needle bar 8| mounted for vertical or longitudinal reciprocation in the head H and a pair of loopers 82 and 83 on a looper carrier 84 secured to the looper shaft 19 adjacent its forward end. Except as hereinafter mentioned, these instrumentalities may be substantially as shown and described in the Dahl patent, No. 862,238, August 6, 1907, but, specifically, as shown herein are substantially as more fully shown and described in application Serial No. 64,693, filed February 19, 1936, by Joseph H. Pikul. The sewing thread t is supplied to the needle 80 from a suitable source, not shown, through a tension device 85' and suitably arranged guides on the head and needle bar and shown, for example, at 88 and 81, under the control of the usual take-up 88 which, in this instance, is-operated by a cam 89 upon the shaft 16.

The needle bar 8| is' longitudinally reciprocated by a crank pin 90 carried by the cam 89 and connected by suitable linkage 9| with a collar 92 on said needle bar, and is guided adjacent its upper end in a bearing 93 which, as shown, is carried by a flexible metallic disk 94 suitably clamped in a recess 95 in the upper end of the head II. This mounting of the needle bar guide 93 may be, and as shown is, substantially as more fully shown and described in the Reece Patent No. 1,993,350, March 5, 1935, and is such as to permit the needle bar a limited universal'swinging movement about the point of intersection of its axis with the plane of the disk 94. Adjacent its lower end the needle bar is guided in a bearing 96 similarly mounted by means of a disk 91 in a carrier member 98 mounted, as hereinafter described, for movement in a horizontal plane both laterally and longitudinally of the machine frame.

In attaching a two-hole button B, as shown in successive descents of the needle 88' to cause said needle to pass alternately through the holes h and 71 in the button, the looper carrier being at this time oscillated laterally by the shaft 19 to cause the loopers to cooperate with the needle in the formation of stitches s passing through said holes and serving to attach the button to the fabric W. In' attaching a four-hole button, such as shown at B in Fig. 3, the same operations are performed to form a series of attaching stitches s passing through the holes h and h after which the carrier 98 is shifted longitudinally, or in a direction fore and aft of the machine, to bring the needle into the plane of the holes k and h of the other pair, the looper shaft 19 with the looper carrier 84 and loopers 82 and 83 being similarly shifted to maintain the cooperative relationship of said loopers with the needle. Thereafter the sewing operations are repeated to form a second set of attaching stitches t passing through the holes h and 71.

Specifically the presser foot 14 and button clamp 15 carried thereby form no portion of the present invention and may be of any construction and arrangement suitable to perform their intended functions and permit the operation of the stitch-forming instrumentalities as above described. As shown, the presser foot 14 is secured to a short upright rod I00, (see Figs. 1, 7 and 8) carried by an arm IOI projecting from a slide I02 guided for vertical movement in the head'1l, the arrangement being substantially as more fully shown and described in application Serial No. 77,178, filed April 30, 1936, by the present applicants. The slide I02 is normally held downward to urge the presser foot against the work by a spring I03 but may be moved upwardly against the tension of said spring, to raise the presser foot, by a lever I04 connected by a chain I05 with a suitable treadle, not shown.

The carrier member 96 for the lower needle bar guide 96 is guided for longitudinal movement in a groove in the top of a head I06 (Figs. 1, 4, 15 and 17) having a shank or trunnion I01 received in a socket I08 in the bottom wall of the head H of the machine, whereby said head I06 is pivoted for oscillation about the axis .of said shank. Said carrier is, therefore, free to move longitudinally in the head I05 or to oscillate laterally with said head about the pivotal axis of the latter. Said carrier'is further held and guided for movement in a horizontal plane by channel members I09 (Figs. 1 and 10) each secured to bosses I I0 on the bottom wall of the head 1| by bolts III (see also Fig. 4), said carrier being retained within the grooveof said channel by a cover plate I I2 secured in place by said bolts III.

The carrier 98 is oscillated laterally aboutthe.

axis of the pivot I01 to cause the needle to pass alternately through the holes h, h. (Fig. 2) h h (Fig. 3) or h 71. by mechanism most clearly 5 shown in Fig. 17. Said mechanism comprises a link II3,having a pin or stud II4 (see also Figs. 9 and 20) a downwardly projecting portion of which is received in a longitudinally disposed way H5 (Fig. 16) in the upper face of the carrier 98, and an upwardly projecting portion of which is received in a way H0 (Fig. 20) in a head I I1 having a shank II8 pivoted in a bracket H9 in the head 1|. The way I I6 permits lateral movement of the stud H4, and consequently lateral oscillation of the carrier, while holding said stud against longitudinal movement in the way I I5; while the latter way permits longitudinal movement of the carrier 98 independently of said stud as hereinafter explained. The opposite end of the link H3 is provided with a stud I20 received in an arcuate groove I2I in one arm of a lever I22 (see also Figs.

9, 15 and 18) secured to an upright shaft I23 journailed in a bearing I24 depending from the top of the head 1I. At its opposite end the lever I22 carries a pair of pins'I 25 and I26 (see also Fig. 19) adapted, respectively, for alternative engagement with cam grooves I21 and I28 in the upper face of a main cam I29 fast on the vertical cam shaft 18. In order to avoid confusion, the cam grooves I21 and I28 are only partially-indicated in Figs. 4, 17, 25, 28,. 29 and 36 but are clearly shown in full in Fig. 11. It will be seen that, when either of the pins I25 or I26 is engaged with its groove I21 or I28, rotation of the cam I29 will cause the lever I22 to swing about the axis of the shaft I23, and that this movement will be transmitted from said lever to the carrier 98 through the link H3.

The amplitude of the lateral vibration thus imparted to the carrier 98 will depend upon the point of engagement of the stud I20 with the groove I2I, and in order to permit this to be readily adjusted in accordance with the lateral spacing of the holes in the button, the link H3 is provided with a third stud I30 engaged by a fork I3I (see also Figs. 4, 5, 9 and 14) carried by a slide I32 guided for horizontal movement on the side wall of the head H by a stud I33 projecting inwardly from said wall and engaging :a slot I34 in the slide and a clamp screw I35 projecting through a slot I36 in the wall and in threaded engagement with'said slide. By loosening the clamp screw the slide I32 may be moved longitudinally, and by tightening said clamp screw it may be secured in adjusted position.

As shown in Fig. 19, the pins I25 and I26 are formed with rack portions connected bya pinion I31, whereby when one of saidpins is moved into operative position in engagement with its groove in the cam I29, the other of said pins will be lifted out of such position. Accordingly said pins may be rendered alternatively operative to place the lever I22 under the control of the cam groove I21 or I28, and thereby vary the number of stitches in each group s, s or s (Figs. 2 and 3), as hereinafter more fully explained. One of the pins, herein the pin I25, is formed with a grooved head I38 engaged by a fork I39 (see also Figs. 20 and 24) carried by one arm of a three -armed lever L pivoted at L within a casing I45 secured to the exterior of the head 1 I. A second upstanding arm I40 of the lever L is provided with an operating handle I4I conveniently accessible from the exterior of the casing I45 and carrying a looking pin I42 engageable with apertures I43 in a lug I44 on the top of said casing, whereby said lever may be locked in either one of two positions to render either of the pins I25, I26 operative.

The mechanism for moving the carrier 98 longitudinally is likewise shown in Fig. 17 and comprises a link I46 having at its forward end a stud I41 received in a transverse groove or way I48 in the upper face of the carrier 98 adjacent its rear end. This construction permits the carrier to be swung laterally by the link I I3, as above described, independently of the link I46 and stud I41. The stud I41 also pivotally connects the link I46 with an arm I49 (see also Fig. 24) on a vertical rock shaft I50 journalled in suitable bearingson the interior of the main casing, said connection servbetween the branches of which is pivoted the end of a link I56 having a slot I51 (Fig. 22) to receive a stud I58 (Fig. 15) depending from a bracket or interior frame member I59 within the main casing and the form of which is most clearly shown in Fig. 9. The link I56 is, therefore, guided on the stud I58 by engagement of the latter with the slot I51 and is supported by a flange or head I60 on the lower end of the stud. The link I56 has secured thereto a pair of contact or camfollower' blocks I6I embracing between them and cooperating with an edge cam I62 rotatably mounted on the stud I58 and the hub of which is provided with a spur gear I63 meshing with a pinion I64 on the lower end of the main cam shaft 18. The gear I63 and pinion I64 are of such sizes as to constitute two to one gearing between the cam I62 and the cam shaft 18, so that the cam I62 is rotated at one half the speed of the main cam I29. Accordingly, after one complete rotation of the cam I29 to cause the cam groove I21 or I 28 thereof to produce a predetermined number of lateral reciprocations of the needle bar to form, for example, the group of stitches s (Fig. 3) the cam I62 will cause the carrier 98 and needle bar to be shifted longitudinally of the machine in one direction, after which a second rotation of the cam I29 will cause the necessary number of lateral reciprocations to form the group of stitches s whereupon the cam I62 will return the carrier and needle bar to their original longitudinal positions.

The amplitude of the longitudinal or fore and aft movement of the carrier 98 and needle bar 8| is determined by the position of the stud I5I in the groove I52 of the arm I53, and, in order that this may be conveniently adjusted in accordance with the fore and aft spacing of the holes 71. h, and h h there is provided a fork I 65 (Figs. 15, 20 and 21) carried by a yoke I66 the arms of which are co-axially pivoted in the bracket H9 and in a boss I61 in the top of the head 1I respectively. The pin I68 which constitutes the upper pivot of the yoke I66 extends through the top wall of the head II to the exterior of the latter and has secured thereto a hand lever I69. The hand lever I69 carries a manually releasable, spring pressed locking pin I18 which normally engages an opening "I (Fig. 15) in a segmental index plate I12 mounted to turn about the pivot pin I68 to an extent limited by the engagement of a pin I13 on the top of the head with an arcuate slot I14 in said plate. The plate I12 has on its edge a graduated scale I15 cooperating, as the plate is turned, with an index mark I16 on the top of the head, said plate being secured in adjusted position by a clamp screw I11. The handle I69 being normally locked to the plate I12 by the plunger I18, when said plate is turned into a predetermined position, as indicated by registration of the proper point on the scale I15 with the index mark I 16, the stud I 5I will be moved in the slot I52 to vary the amplitude of the fore and aft movement of the carrier 98, it being understood that the graduations on the scale I15 are suitable to indicate fore and aft spacing of pairs of holes in a four-hole button. A spring I18 is suitably connected with the yoke I66 to tend to turn the latter in a counter-clockwise direction as shown in Fig. 21, so that by releasing the locking pin I18, said spring willturn the yoke to cause the fork I65 to move the pin I5I into a position co-axial with the shaft I54, whereupon there will be no longitudinal movement of the carrier 98, thereby adjusting the machine for operation upon a two-hole button.

Figs. 4 and 17 show the adjustment of the parts for a four hole button having the maximum hole spacing for which the machine is adapted. Fig. 28 shows the adjustment for a two hole button of maximum hole spacing. Fig. 29 shows the adjustment for a two hole button having holes more closely spaced. It will be obvious that for a four hole button of closer spacing the adjustment would be similar to that shown in Fig. .29 but with the stud I5I in a position intermediate the positions shown in Figs. 17 and 28.

The looper shaft 19 is slidably mounted at its rear end in a sleeve I19 (see Fig. 25) rotatably mounted in a suitable bearing in the frame member I59. Adjacent the forward end of the sleeve I19 the shaft 19 has secured thereto a collar I88,

and the contiguous ends of said sleeve and collar are suitably formed to constitute the complementary elements of a slip coupling or clutch connecting the sleeve and shaft for oscillation in unison while permitting longitudinal movement of the shaft relative to the sleeve. At its rear end the sleeve I19 is formed with a head I8I having a transverse bore I82 in which a stud I83 is rotatably and slidably mounted. The stud I83 is provided with a head I84 (see also Figs. 23 and 24) having a transverse bore in which is slidably and rotatably received a stud I85 secured within and projecting-longitudinally from the end of an arm I86 secured to one end of a transverse rock shaft I81 (see also Fig. 1) journalled in a suitable bearing in the frame member I59. By this construction the shaft I81 and sleeve I19, although disposed perpendicular to one another, are connected for oscillation in unison. At its opposite end the rock shaft I81 has secured thereto a bifurcated arm I88 between the bifurcations of which is pivoted at I89 the lower end of a link I98. The upper end of the link I98 is provided with a transverse stud I9I the inwardly projecting end of which is received in an arcuate groove I92 in one end of a lever I93 fuicrumed at its opposite end on a stud I 94 projecting. inwardly from the side wall ofthe housing 12. Intermediate its ends the lever I 93 carries a pair of pins I95 and I 96 adapted respectively for alternative engagement with cam grooves I 91 and I98 formed in the side or periphery of the main cam I29. The pins I95 and I96 like the pins I25 and I26, are formed with rack portions connected by a pinion I99 (Fig. 27) whereby when one is projected into its cam groove, the other will be withdrawn, and viceversa. One of said pins, herein the pin I96, is formed with a grooved head 288 engaged by a fork 28I carried by the third arm of the three-armed lever L. The arangement is such that when the pin I 26 is engaged with the groove I 28, the pin I96 is engaged with the groove I98; and when the pin I25 is engaged with the groove I21, the pin I95 is engaged with the groove I91. The groove I91 corresponds to the groove I21, that is to say, the number and timing of the oscillations of the looper shaft 19 produced by the former correspond to the number and timing of the lateral oscillations of the needle produced by the latter. Similarly the groove I98 corresponds to the groove I28. Accordingly the oscillations of the loopers are synchronized with the lateral oscillations of the needle, and it is obvious that the amplitude of the former must vary with the amplitude of the latter. The amplitude of oscillation of the looper shaft 19 depends upon the position of the stud I9I' in the groove I92 of the lever I93, and in order that this position may be suitably adjusted concurrently with the adjustment of the position of the stud I28 in the groove I2I of the lever I22, the slide I 32 (Fig. 14) by which the latter stud is adjusted is provided with a depending flange 282 having a slot 283 to receive the outwardly projecting end of the pin I9I (see also Fig. 1). Consequently, when the slide I32 is adjusted in accordance with the lateral spacing of the holes in the button, the studs I28 and I9I will be simultaneously adjusted to control both the lateral throw ofthe needle and the amplitude of vibra- 

